County annual report · FIPS 06097
2018 Sonoma County, CA Power Outage Report
In 2018, customers in Sonoma County, CA went without power for an average of 1.9 hours, a total of 404K customer-hours (California average 3.7 hours). That ranks 33rd worst of 57 California counties and 1915th of 2,798 nationally.
Compared with CA, the US and 2017
Coverage line is EAGLE-I's share of California customers tracked each year.
Biggest outages in Sonoma County, 2018
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | July 1, 2018 15:00 | July 2, 2018 02:00 | 11h | 18,925 | 39K |
| 2 | December 24, 2018 14:30 | December 27, 2018 01:45 | 2d 11h | 9,037 | 19K |
| 3 | December 1, 2018 06:00 | December 1, 2018 14:45 | 8h 45m | 6,050 | 9,660 |
| 4 | June 10, 2018 14:45 | June 14, 2018 00:00 | 3d 9h | 6,002 | 10K |
| 5 | June 14, 2018 06:00 | June 15, 2018 05:30 | 23h 30m | 4,063 | 6,426 |
| 6 | December 19, 2018 13:00 | December 21, 2018 04:30 | 1d 15h | 3,478 | 12K |
| 7 | October 12, 2018 15:30 | October 17, 2018 04:45 | 4d 13h | 3,458 | 8,838 |
| 8 | October 8, 2018 14:30 | October 9, 2018 02:15 | 11h 45m | 3,148 | 3,873 |
| 9 | November 21, 2018 13:30 | November 25, 2018 07:45 | 3d 18h | 3,134 | 10K |
| 10 | December 21, 2018 10:45 | December 22, 2018 07:30 | 20h 45m | 2,904 | 3,745 |
Outage episodes by size in 2018: 148 reached 100+ customers, 27 reached 1,000+ customers, 1 reached 10,000+ customers.
Utility reliability filed with the EIA
SAIDI (average outage time per customer) and SAIFI (average interruptions per customer) that utilities serving Sonoma County reported on EIA Form 861 for 2018, or their most recent earlier filing. Utility-wide figures, not county-specific.
| Utility | EIA year | SAIDI | SAIFI | SAIDI excl. major events | SAIFI excl. major events |
|---|---|---|---|---|---|
| Pacific Gas & Electric Co. | 2018 | 5.0 hrs | 1.18 | 2.1 hrs | 1.08 |
| City of Healdsburg - (CA) | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 91% of California's customers in 2018; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 214,127 customers (ORNL modeled county customer count), including major storm days. It is comparable across counties but is not the SAIDI a utility files.
- An outage event is a continuous stretch with customers out; counts at 100, 1,000 and 10,000+ use its peak.
- Years loaded: 2015–2025. Sonoma County has data for 2017–2025.
Cite this report
MassOutage (massoutage.com), Sonoma County, CA annual power outage report, 2018, data as of Oct 3, 2026 02:41 UTC, sources: DOE EAGLE-I (https://eagle-i.doe.gov/); EAGLE-I modeled customer counts (MCC) (https://figshare.com/); EIA Form 861 (utility reliability) (https://www.eia.gov/electricity/data/eia861/). https://massoutage.com/reports/2018/california/sonoma-county